Method for cooperatively regulating and controlling self-diluting water quantity of thickener through rotary mixing drum

Abstract

The invention discloses a method for cooperatively regulating and controlling the self-dilution water quantity of a thickener through a rotary mixing drum, relates to the technical field of thickener feeding wells and dilution modes thereof, and aims at solving the problems that the addition quantity of dilution water in the feeding wells is reasonably controlled, the sedimentation effect is poor due to unreasonable flocculation concentration and the like. The method comprises the following steps: S1, setting program parameters of a control system according to design indexes of a specific thickener; s2, when the thickener runs, the control system collects the concentration of the slurry entering the thickener in real time by controlling the ore pulp concentration meter, and further collects the flow of the slurry entering the thickener in real time through the ore pulp flow meter; the adaptability of the thickener in the aspects of feeding concentration and flow fluctuation is improved, the defect that an original fixed dilution opening cannot adjust the dilution water amount is overcome, the flocculation effect of a feeding well is improved, flocculant consumption is reduced, and the fractal dimension of flocs is improved, so that the comprehensive benefits of the thickener are improved.

Description

Technical Field

[0001] The invention relates to the technical field of a thickener feed well and a dilution method thereof, and in particular to a method for cooperatively regulating the amount of self-dilution water of a thickener by a rotating mixing drum. Background Art

[0002] As the main equipment for solid-liquid separation, the thickener is often faced with many challenges such as large flow, large fluctuation and unstable incoming material concentration. If the process indicators of the thickener fluctuate greatly, the subsequent process will be unable to operate. Therefore, improving the process stability of the thickener is the key to controlling the entire dehydration process.

[0003] The feed well is one of the core components of the thickener. Various thickeners mainly rely on the flocculation of the slurry and flocculant in the feed well to achieve the effect of increasing the particle settling rate. The flocculation concentration in the feed well is one of the key factors to achieve a good flocculation effect. In the production practice, the slurry feed concentration of the thickener is usually not the optimal flocculation concentration. Therefore, it is necessary to mix and dilute the high-concentration slurry with dilution water to reach an appropriate flocculation concentration range, thereby improving the subsequent flocculation and sedimentation effect of the thickener.

[0004] At present, mainstream thickener feed wells are equipped with self-dilution structures or forced dilution pump systems. The self-dilution structure uses the concentration difference principle to naturally return the supernatant in the thickener to the feed well through the opening channel of the feed well, and relies on the turbulence generated by the slurry flow process for natural mixing. This structure is usually designed at the beginning of the design, based on engineering experience or theoretical calculations of designers, and a fixed design input parameter is used to reasonably design the position and size of the opening channel. However, after the thickener is put into production, it often operates under a large fluctuation range of the incoming material. At this time, the dilution effect cannot be guaranteed, and the operation is often maintained by increasing the amount of flocculant or reducing the thickener indicators.

[0005] Another way is to configure the feeding well with an additional forced dilution pump system, but the disadvantages of this method include: ① If a fixed-frequency dilution pump is used, its model is often difficult to determine accurately, because the fluctuation of incoming materials causes the demand for dilution water to change at any time; ② Additional power is required, because the dilution pump needs to lift the supernatant as dilution water and then transport it to the feeding well; ③ Even if the frequency conversion method is used to change the flow rate of the pump, its head may be unreasonable, resulting in the dilution water flow returning to the feeding well being able to be met through control measures, but the unreasonable head, that is, the residual head, may cause the natural flow field in the feeding well to be destroyed, affecting the flocculation effect. Summary of the invention

[0006] In order to solve the above problems, that is, to solve the problems raised by the above background technology, the present invention proposes a method for coordinating the self-dilution water volume of a thickener with a rotating mixing drum, which includes the following steps: S1, setting the program parameters of the control system according to the design indicators of the specific thickener; S2, when the thickener is running, the control system collects the slurry concentration entering the thickener in real time by controlling the slurry concentration meter, and further collects the slurry flow entering the thickener in real time by using the slurry flow meter; S3, according to the set value of the control system, the control system calculates the dilution water flow Q required for the slurry in real time D The specific rotation angle of the rotating dilution well is fed back according to the calculation program through the required dilution water flow rate. ; S4. The control system sends a control signal to the hydraulic motor according to the setting value of the specific rotation angle required, controls the hydraulic motor motor to rotate the gear, and drives the rotating dilution well to rotate; S5. The control system automatically calculates the required flocculant addition amount Q according to the program setting value through the real-time data of the slurry concentration meter and the slurry flow meter. floc ; Configuration of flocculant solution: Flocculant dry powder and water are mixed into a flocculant solution of a certain concentration by adding flocculant preparation cylinder. The control system controls the flocculant adding pump and collects the data of the agent flow meter in real time, and adjusts the flocculant addition amount Q according to the reasonable flocculant addition amount. floc Control the flow rate of flocculant solution; S6. Repeat the above process according to the process fluctuation of the incoming material, and regularly update the relative position of the dilution port and the amount of flocculant added to maintain the slurry concentration C in the feed well. T In the optimal flocculation concentration range.

[0007] The present invention is further configured as follows: in said S1, the design index includes the thickener feed concentration C F , feed mass flow Q F , flocculant addition amount Q floc and reasonable flocculation concentration C in the feed well T The design indicators are obtained from the previous flocculation and sedimentation experiments or corrected by subsequent on-site sampling verification experiments after production.

[0008] The present invention is further configured as follows: in S3, the rotation angle of the rotating dilution well is The control range is 0~20°.

[0009] The present invention is further configured as follows: the thickener includes a slurry distribution well, a rotary dilution well, a thickener tank body, a feeding pipeline, a flocculant addition pipeline and a control system, the feeding pipeline is provided with a slurry concentration meter and a slurry flow meter, the flocculant addition pipeline includes a flocculant preparation cylinder, a flocculant addition pump and a reagent flow meter, the control system is controlled and connected with a hydraulic motor, a flocculant addition pump, a slurry concentration meter, a slurry flow meter and a reagent flow meter, the outer wall of the slurry distribution well is provided with a rotary dilution well, the bottom end of the slurry distribution well is provided with a plurality of discharge channels, the side wall of the rotary dilution well is provided with a plurality of self-dilution channels, the bottom end of the rotary dilution well is provided with a conical distribution plate through an angle steel, the inner wall of the rotary dilution well is provided with a buffer distribution plate, and the rotary dilution well is driven to rotate by a hydraulic motor.

[0010] The present invention is further configured as follows: an underflow pump is provided at the bottom of the thickener tank body.

[0011] The present invention is further configured as follows: the feed pipeline is overlapped in the well of the slurry distribution well, and the flocculant addition pipeline is overlapped in the well of the rotary dilution well.

[0012] The beneficial technical effects of the present invention are as follows: the present invention improves the adaptability of the thickener in terms of feed concentration and flow fluctuations, improves the deficiency of the original fixed dilution port in that the dilution water volume cannot be adjusted, improves the flocculation effect of the feed well, reduces flocculant consumption, and improves the fractal dimension of the flocs, thereby improving the comprehensive benefits of the thickener. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of the thickener feed system is shown.

[0014] Figure 2 A schematic diagram of feed flow and concentration is shown.

[0015] Figure 3 The amount of dilution water is shown Feeding speed And the rotation angle surface plot of the rotating well.

[0016] Figure 4 A schematic diagram of low-concentration and low-flow operation is shown.

[0017] Figure 5 A schematic diagram of low-concentration and high-flow operation is shown.

[0018] Figure 6 A schematic diagram of high-concentration and high-flow operation is shown.

[0019] Figure 7 A schematic diagram of high concentration and low flow operation is shown.

[0020] Figure numerals: 1. Slurry distribution well, 2. Rotary dilution well, 3. Thickener tank body, 4. Hydraulic motor, 5. Underflow pump, 6. Flocculant preparation cylinder, 7. Flocculant addition pump, 8. Slurry concentration meter, 9. Slurry flow meter, 10. Reagent flow meter, 11. Control system. DETAILED DESCRIPTION

[0021] Please refer to the attached Figure 1-7 Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0022] The thickener includes a slurry distribution well 1, a rotary dilution well 2, a thickener tank body 3, a feeding pipeline, a flocculant addition pipeline and a control system 11. A slurry concentration meter 8 and a slurry flow meter 9 are provided on the feeding pipeline, and the feeding pipeline is overlapped in the well of the slurry distribution well 1. The flocculant addition pipeline includes a flocculant preparation cylinder 6, a flocculant addition pump 7 and a reagent flow meter 10, and the flocculant addition pipeline is overlapped in the well of the rotary dilution well 2. The control system 11 controls and is connected with a hydraulic motor 4, a flocculant addition pump 7, a slurry concentration meter 8, a slurry flow meter 9 and a reagent flow meter 10. The outer wall of the slurry distribution well 1 is provided with a rotary dilution well 2, the bottom end of the slurry distribution well 1 is provided with a plurality of discharge channels, the side wall of the rotary dilution well 2 is provided with a plurality of self-dilution channels, a conical distribution plate is installed at the bottom end of the rotary dilution well 2 through an angle steel, a buffer distribution plate is provided on the inner wall of the rotary dilution well 2, and the rotary dilution well 2 is driven to rotate by the hydraulic motor 4, and the rotation angle The control range is 0-20°. An underflow pump 5 is provided at the bottom of the thickener tank body 3. The underflow pump 5 is used to control the discharge of the thickened solid particles through the underflow discharge port.

[0023] The slurry enters the slurry distribution well 1 through the feeding pipeline, and after preliminary distribution in the slurry distribution well 1, it is discharged from the discharge channel to the rotary dilution well 2. At the same time, the dilution water enters the barrel through the self-dilution channel on the rotary dilution well 2 to mix with the slurry. The hydraulic motor 4 drives the rotary dilution well 2 to rotate, adjusts the relative position of the self-dilution channel and the discharge channel, and adjusts the pressure difference between the two channels to control the amount of self-dilution water, so that the slurry in the rotary dilution well 2 maintains the optimal flocculation concentration, improves the efficiency of the reagent use, and improves the sedimentation effect. After the slurry is buffered and distributed by the buffer distribution plate in the rotary dilution well 2, it is fully mixed with the dilution water. The mixed slurry is evenly distributed to the thickener tank body 3 through the conical distribution plate. The main drive motor drives the stirring device to stir the slurry to accelerate the sedimentation of solid particles. The supernatant flows out through the overflow weir, and the concentrated solid particles are discharged through the underflow discharge port.

[0024]

[0025] therefore,

[0026] Where: C F —Thickener feed concentration, unit: w / w%; Q F —Feeding mass flow rate, unit: t / h; Q floc —Amount of flocculant added, unit L / min; C T —reasonable flocculation concentration in the feed well, unit: w / w%)); Q D —Target dilution water flow rate, in m³ / h.

[0027] The feed concentration C is obtained by the slurry concentration meter 8 F The specific value of the feed mass flow Q is obtained through the slurry flow meter 9 F The specific value of the reasonable flocculation concentration C in the feed well T Obtained from experimental data or production site commissioning results, the target dilution water flow rate Q can be obtained in real time D The specific value of .

[0028] Adjust the actual dilution water volume Approaching or reaching the target dilution water flow rate Principle: Actual dilution water volume Feeding speed and the rotation angle of the rotating well The dilution water volume and feed rate can be obtained by fitting the computer simulation experiment or the industrial data after operation. and the rotation angle of the rotating well Two-dimensional polynomial function Therefore, the actual dilution water volume can be obtained by the following formula:

[0029] Where feed rate Has the following relationship:

[0030] Where: D—inner diameter of the pipe, in m; v F —average velocity of the fluid, in m / s; —Slurry density, unit: t / m³; n—Number of branch pipes in the distribution well, in pieces.

[0031] Average fluid velocity The feed mass flow rate can be obtained from the slurry flow meter 9 Calculated, therefore, the actual amount of water to dilute The rotation angle of the rotating well can be adjusted , so that:

[0032] The amount of flocculant solution added is calculated as follows:

[0033] Where: Q floc —Amount of flocculant solution added, unit L / min; C floc —Flocculant solution concentration, unit: %; R—flocculant addition amount, unit: g / t.

[0034] Example: A comparative experiment was conducted on a laboratory thickener with a diameter of 1600mm and a feed well diameter of 270mm. The material used was iron tailings from a beneficiation plant, and the optimal flocculation concentration was 6% to 8% according to the flocculation experiment.

[0035] Design process parameters: feed flow rate 100L / min, feed concentration 10%, the equipment runs for a total of 100 minutes, and four process conditions are adjusted respectively, namely low concentration and low flow rate: feed concentration is about 5%, feed flow rate is about 80L / min; low concentration and high flow rate: feed concentration is about 5%, feed flow rate is about 120L / min; high concentration and high flow rate: feed concentration is about 15%, feed flow rate is about 120L / min; high concentration and low flow rate: feed concentration is about 15%, feed flow rate is about 80L / min. Figure 2 As shown: The actual dilution water volume is obtained according to the computer simulation experiment Feeding speed and the rotation angle of the rotating well, satisfying Figure 3 The surface can be calculated according to the following formula after fitting:

[0036] Where: K1=-1.07515; K2=0.03992; K3=3.14095; K4=-0.00326; K5=-1.00112; K6=0.00316;

[0037] Combined with Table 1 and Figure 4-Figure 7 , the experimental results of the four cases are as follows: Depend on Figure 4 It can be seen that under the conditions of low concentration and low flow, the fractal dimension of the flocs with the adjustable dilution port is 1.53, and the fractal dimension of the flocs with the fixed dilution port is 1.44.

[0038] Depend on Figure 5 It can be seen that under the condition of low concentration and high flow rate, the fractal dimension of the flocs with adjustable dilution port is 1.67, and the fractal dimension of the flocs with fixed dilution port is 1.84.

[0039] Depend on Figure 6 It can be seen that under high concentration and high flow conditions, the fractal dimension of the flocs with the adjustable dilution port is 1.74, and the fractal dimension of the flocs with the fixed dilution port is 1.76.

[0040] Depend on Figure 7 It can be seen that under the condition of high concentration and low flow rate, the fractal dimension of the flocs with adjustable dilution port is 1.63, and the fractal dimension of the flocs with fixed dilution port is 1.81.

[0041] It can be seen that during the operation of the thickener, compared with the traditional fixed dilution port, the flocculation effect of the rotary dilution port is the best, which reduces the consumption of flocculants and increases the fractal dimension of the flocs, thereby improving the comprehensive benefits of the thickener.

[0042] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0043] In the description of the present invention, terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0044] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.

[0046] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A method for coordinating the amount of self-dilution water in a thickener by rotating a mixing drum, characterized in that: The following steps are involved: S1. Set the program parameters of the control system according to the design indicators of the specific thickener; S2. When the thickener is running, the control system collects the slurry concentration entering the thickener in real time by controlling the slurry concentration meter, and further collects the slurry flow entering the thickener in real time by using the slurry flow meter; S3. According to the setting value of the control system, the control system calculates the dilution water flow Q required for the slurry in real time. D The specific rotation angle of the rotating dilution well is fed back according to the calculation program through the required dilution water flow rate. ; S4, the control system sends a control signal to the hydraulic motor according to the set value of the specific rotation angle required, controls the hydraulic motor motor to rotate the gear, and drives the rotary dilution well to rotate; S5. The control system automatically calculates the required amount of flocculant Q according to the program setting value through the real-time data of the slurry concentration meter and the slurry flow meter. floc ; Configuration of flocculant solution: Flocculant dry powder and water are mixed into a flocculant solution of a certain concentration by adding flocculant preparation cylinder. The control system controls the flocculant adding pump and collects the data of the agent flow meter in real time, and adjusts the flocculant solution according to the reasonable addition amount Q of the flocculant. floc Control the flow rate of flocculant solution; S6. According to the process fluctuation of the incoming material, repeat the above process, regularly update the relative position of the dilution port and the amount of flocculant added, so as to maintain the slurry concentration C in the feed well. T In the optimal flocculation concentration range.

2. The method of claim 1 wherein the rotary mixing drum coordinately controls the amount of self-dilution water in the thickener, characterized in that: In S1, the design indicators include the thickener feed concentration C F , feed mass flow Q F , flocculant addition amount Q floc and the reasonable flocculation concentration C in the feed well T The design indicators are obtained from the previous flocculation and sedimentation experiments or corrected by subsequent on-site sampling verification experiments after production.

3. The method of claim 1 wherein: In S3, the dilution well is rotated by an angle of The control range is 0~20°.

4. A rotary mixing drum coordinated control thickener according to claim 1, characterized in that: The thickener comprises a slurry distribution well (1), a rotary dilution well (2), a thickener tank body (3), a feed pipeline, a flocculant addition pipeline and a control system (11), wherein the feed pipeline is provided with a slurry concentration meter (8) and a slurry flow meter (9), the flocculant addition pipeline comprises a flocculant preparation cylinder (6), a flocculant addition pump (7) and a reagent flow meter (10), and the control system (11) controls a hydraulic motor (4), a flocculant addition pump (7), a slurry concentration meter (8) and a reagent flow meter (10). , a slurry flowmeter (9) and a reagent flowmeter (10), the outer wall of the slurry distribution well (1) is provided with a rotating dilution well (2), the bottom end of the slurry distribution well (1) is provided with a plurality of discharge channels, the side wall of the rotating dilution well (2) is provided with a plurality of self-dilution channels, the bottom end of the rotating dilution well (2) is provided with a conical distribution plate through angle steel, the inner wall of the rotating dilution well (2) is provided with a buffer distribution plate, and the rotating dilution well (2) is driven to rotate by a hydraulic motor (4).

5. A rotary mixing drum coordinated control thickener according to claim 4, characterized in that: An underflow pump (5) is provided at the bottom of the thickener tank body (3).

6. A rotary mixing drum coordinated control thickener according to claim 4, characterized in that: The feed pipeline is overlapped in the well of the slurry distribution well (1), and the flocculant addition pipeline is overlapped in the well of the rotary dilution well (2).

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